investigation of factors affecting seed germination of london rocket (sisymbrium irio)

in order to investigate factors affecting on seed germinating of london rocket (sisymbrium irio), lab experiments were set up in 2011 at the payamenoor university, mashhad, khorasan razavi province. effect of different concentrations of gibberellic acid (ga3) and cytokinin, wet and dry prechilling duration, hydrogen peroxide duration, ethanol, salt and osmotic stress and burial depth on seed germination and seedling emergence were investigated. increasing concentration of ga3 from 50 ppm to 100 ppm enhanced germination of london rocket, but higher concentration of ga3 had inhibition effect. wet prechilling was more effective than dry prechilling in seed germinating of london rocket. increasing concentration of cytokinin decreased seed germination. seed germination of london rocket was reduced by increase in duration of soaking in hydrogen peroxide. ethanol had inhibition effect on germination osmotic and salt stress decreased seed germination. seed germination decreased with increase in burial depth. results from the study could be used for integrated weed management programs.